Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Distribution Switches, Load Drivers

Diodes Incorporated DRDNB21D-7

Name: DRDNB21D-7
Brand: Diodes Incorporated
SKU: DRDNB21D-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: DRDNB21D-7

Manufacturer:: Diodes Incorporated

Category:: Power Distribution Switches, Load Drivers

Package:: 6-TSSOP, SC-88, SOT-363

Datasheet:: DRDNB21D-7.pdf

Description:: IC PWR DRIVER BIPOLAR 1:1 SOT363

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,246

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

DRDNB21D-7 from Diodes Incorporated is a dual-channel pre-biased NPN transistor array with integrated switching diodes in a single SOT-363 package, designed for relay driver applications. It integrates two 50 V V_CEO NPN transistors (R₁/R₃ = 2.2 kΩ, R₂/R₄ = 47 kΩ) and two 75 V V_RWM switching diodes, delivering 100 mA output current per channel and 4.0 ns reverse recovery time for fast relay coil flyback suppression.

For engineers reviewing the DRDNB21D-7 datasheet, DRDNB21D-7 pinout, DRDNB21D-7 application, or DRDNB21D-7 equivalent, key selection criteria include verified input resistor network tolerance (±30%), guaranteed V_CE(SAT) ≤ 0.3 V at I_C/I_B = 50 mA/0.25 mA, thermal resistance of 625 °C/W, and AEC-Q101 readiness via automotive-grade Q-suffix variants.

Technical Context

The DRDNB21D-7 implements a monolithic dual-channel relay driver architecture where each channel combines a pre-biased NPN transistor with a dedicated anti-parallel switching diode. The internal resistor network (2.2 kΩ base-input, 47 kΩ base-emitter) eliminates external bias components and ensures consistent turn-on at V_IN ≥ 1.1 V while maintaining < 0.5 µA leakage at V_CC = 50 V.

Each diode exhibits 0.72 V forward voltage at 10 mA and 4.0 pF capacitance at 0 V reverse bias, enabling low-loss flyback energy clamping. The device operates across –55 °C to +150 °C junction temperature and meets JEDEC high-reliability standards with Level 1 moisture sensitivity.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - supports relay coils up to 48 V DC systems without external snubbing
I_O (per channel)	100 mA - drives standard 12 V/24 V signal relays with margin
V_RWM	75 V - clamps inductive kickback from typical relay coils
t_rr	4.0 ns - minimizes switching loss and EMI during coil de-energization
R₁/R₃	2.2 kΩ ±30% - sets base current for predictable saturation at logic-level inputs
R₂/R₄	47 kΩ ±20% - provides stable turn-off bias to prevent leakage-induced false triggering
P_D	200 mW - limits thermal rise on FR-4 PCB with 1-inch² copper pad
V_F @ 10 mA	0.72 V - reduces power dissipation in diode clamp path during flyback

Pinout & Package

Package: SOT-363 - 6-pin, surface-mount plastic package with 0.65 mm pitch, UL 94V-0 rated molding compound, and matte tin-plated Alloy 42 leads.

Pin/Terminal	Circuit Role	Design Meaning
1	Input 1 (Q1 Base)	Logic-level control input for first NPN transistor; internally connected to R1 and R2
2	Emit 1 (Q1 Emitter)	Common emitter node for Q1; tied to ground reference for relay coil return path
3	Coll 1 (Q1 Collector)	Switched output for first relay coil; connects to one side of coil load
4	Coll 2 (Q2 Collector)	Switched output for second relay coil; isolated from Channel 1 for independent control
5	Emit 2 (Q2 Emitter)	Common emitter node for Q2; separate ground path enables dual-coil isolation
6	Input 2 (Q2 Base)	Logic-level control input for second NPN transistor; internally connected to R3 and R4

Key Features

Feature	Design Value
Integrated bias resistors	Eliminates four external resistors per channel, reducing BOM count and PCB area
Dual-channel isolation	Independent collector/emitter paths prevent crosstalk between relay loads
Fast diode recovery	4.0 ns t_rr suppresses voltage spikes before MOSFET/IC damage thresholds are exceeded
Automotive-ready construction	JEDEC-qualified reliability and IATF 16949 manufacturing enable drop-in use in AEC-Q101-compliant designs
Green packaging	Halogen- and antimony-free mold compound (<900 ppm Br+Cl, <1000 ppm Sb) meets global environmental mandates

Applications

Industrial PLC Output Modules

Automotive Body Control Units

Use Scenario: Driving multiple 12 V/24 V signal relays in programmable logic controller output stages.

IC Role / Device Role / Timing Role: Dual-channel relay driver with integrated flyback diodes and bias networks.

Use Value: Reduces component count by eight passive parts per channel versus discrete solutions, improving long-term field reliability.

Use Scenario: Controlling door lock actuators, window lift motors, and lighting relays in vehicle body electronics.

IC Role / Device Role / Timing Role: AEC-Q101-capable dual switch with 150 °C max junction temperature rating.

Use Value: Enables compact, thermally robust relay interface without external diodes or bias resistors in space-constrained modules.

Smart Home Hub Relay Banks

Medical Equipment Isolation Interfaces

Use Scenario: Managing multi-zone HVAC, lighting, and appliance control relays in residential automation hubs.

IC Role / Device Role / Timing Role: Logic-compatible dual driver supporting 3.3 V/5 V microcontroller GPIOs.

Use Value: Ensures clean turn-on/turn-off transitions with <0.3 V V_CE(SAT), minimizing heat generation in fanless enclosures.

Use Scenario: Providing galvanically isolated relay control in diagnostic imaging and patient monitoring devices.

IC Role / Device Role / Timing Role: High-reliability dual switch qualified to JEDEC high-reliability standards.

Use Value: Delivers >10-year operational life under continuous thermal cycling due to 625 °C/W R_θJA and robust die construction.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual relay driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
NSVD2102PDR2G	Single-channel, 100 mA, 50 V, no integrated diodes - requires external flyback diodes	Limited to single-relay per package; higher BOM count and layout complexity	Choose when only one relay is needed and board space allows discrete diode placement
ULN2003A	7-channel Darlington array, 500 mA per channel, 50 V, integrated diodes - larger SO-16 package	Higher drive capability but consumes more PCB area and draws higher base current	Prefer for multi-relay banks (>2 channels) where footprint is less constrained than power efficiency

Compared with NSVD2102PDR2G and ULN2003A, the DRDNB21D-7 uniquely balances dual-channel integration, minimal external components, and SOT-363 compactness-making it optimal for space-limited, two-relay applications requiring low standby current and fast switching.

Availability

DRDNB21D-7 is available at Aetrix Electronics and suitable for industrial PLC output modules, automotive body control units, and smart home hub relay banks requiring stable component supply, AEC-Q101 traceability, and RoHS-compliant green packaging.

Supply support for DRDNB21D-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, application-optimized components for industrial, automotive, and consumer markets.

The DRDNB21D product line targets compact, high-integration relay interface solutions-designed specifically to replace discrete transistor-diode-resistor combinations in automated assembly environments.

FAQ

What is the maximum operating temperature for DRDNB21D-7?

The DRDNB21D-7 has a specified junction temperature range of –55 °C to +150 °C. Its thermal resistance is 625 °C/W on FR-4 with a 1-inch² copper pad, meaning it can sustain continuous operation at ambient temperatures up to +85 °C when dissipating 100 mW, assuming adequate PCB copper area and airflow.

Does DRDNB21D-7 require external flyback diodes?

No. Each channel integrates a dedicated 75 V V_RWM switching diode connected anti-parallel across its collector-emitter path. These diodes provide complete flyback protection for relay coils without any external components, as confirmed in the Typical Application Circuit on page 6 of DS30756 Rev. 7–2.

Can DRDNB21D-7 be used with 3.3 V microcontrollers?

Yes. The device guarantees turn-on at V_IN ≤ 1.1 V (with V_O = 0.3 V, I_O = 5 mA), and typical input current is 3.6 mA at V_IN = 5 V. At 3.3 V, input current drops to ~2.4 mA, well within GPIO drive capability of modern MCUs, and V_CE(SAT) remains ≤ 0.3 V per channel.

Is there an automotive-grade version of DRDNB21D-7?

Yes. Diodes offers Q-suffix automotive-grade variants (e.g., DRDNB21DQ-7) qualified to AEC-Q101, manufactured in IATF 16949-certified facilities, and PPAP-capable. These versions undergo additional stress testing and change control, and are listed in Diodes' Automotive Products catalog at https://www.diodes.com/products/automotive/automotive-products/.

DRDNB21D-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: 6-TSSOP, SC-88, SOT-363

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Switch Type:: General Purpose

Number of Outputs:: 2

Ratio - Input:Output:: 1:1

Output Configuration:: Low Side

Output Type:: Bipolar

Interface:: On/Off

Voltage - Load:: 50V (Max)

Voltage - Supply (Vcc/Vdd):: Not Required

Current - Output (Max):: 100mA

Rds On (Typ):: -

Input Type:: -

Features:: -

Fault Protection:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-363

DRDNB21D-7 FAQ

1.How can I place an order for DRDNB21D-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DRDNB21D-7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DRDNB21D-7 reliable?

The price and inventory of DRDNB21D-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DRDNB21D-7 is usually 5 days.

3.What payment methods are accepted for DRDNB21D-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DRDNB21D-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DRDNB21D-7?

DRDNB21D-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DRDNB21D-7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DRDNB21D-7?

For technical support, including DRDNB21D-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DRDNB21D-7 requirements.

6.How does Aetrix verify that DRDNB21D-7 is sourced from the original manufacturer or authorized distributors?

All DRDNB21D-7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DRDNB21D-7 meets industry standards.

7.What is the process for return or replacement of DRDNB21D-7?

All DRDNB21D-7 units undergo pre-shipment inspection (PSI). If there is an issue with DRDNB21D-7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DRDNB21D-7 part is unused and in its original packaging.

Return procedure for DRDNB21D-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…